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package WebPAC::Store; |
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|
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use warnings; |
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use strict; |
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|
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use WebPAC::Common; |
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use base qw/WebPAC::Common Class::Accessor/; |
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__PACKAGE__->mk_accessors(qw/database/); |
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|
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use Storable; |
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use File::Path; |
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use Data::Dump qw/dump/; |
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|
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=head1 NAME |
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|
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WebPAC::Store - Store WebPAC data on disk |
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|
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=head1 VERSION |
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|
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Version 0.15 |
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|
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=cut |
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|
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our $VERSION = '0.15'; |
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|
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=head1 SYNOPSIS |
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|
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This module provides disk storage for normalised data and lookups. |
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|
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It is one of newer components of WebPAC, so it will change from time to |
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time. |
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|
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I will try to keep backward compatiblity by providing multiple back-ends, |
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but this can't be garanteed. In other words, don't delete your input |
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databases just yet :-) |
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|
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This has additional advantage. I can create single place to plugin other |
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file formats which provide better performance for particular type of data. |
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|
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=head1 FUNCTIONS |
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|
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=head2 new |
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|
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Create new normalised database object |
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|
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my $store = new WebPAC::Store({ |
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database => 'name', |
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}); |
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|
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Optional parameter C<path> defines path to directory |
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in which cache file for C<data_structure> call will be created. |
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|
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Optional parametar C<database> will be used used as subdirectory in path if no |
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database in specified when calling other functions. |
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|
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=cut |
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|
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=head2 load_ds |
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|
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Retrive from disk one data_structure records usually using field 000 as key |
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|
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my $ds = $store->load_ds( |
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database => 'ps', |
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input => 'name', |
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id => 42, |
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); |
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|
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This function will also perform basic sanity checking on returned |
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data and disable caching if data is corrupted (or changed since last |
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update). |
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|
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C<input> is used to differenciate different source input databases |
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which are indexed in same database. |
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|
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C<database> if B<optional> argument which will override database name used when creating |
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C<WebPAC::Store> object (for simple retrival from multiple databases). |
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|
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Returns hash or undef if cacheing is disabled or unavailable. |
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|
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=cut |
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|
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sub load_ds { |
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my $self = shift; |
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|
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my $log = $self->_get_logger; |
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|
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$log->logconfess("arguments for load_ds must be HASH") unless (ref(\@_) eq 'ARRAY' && ($#_ % 2 == 1)); |
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|
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my $args = {@_}; |
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my $id = $args->{id}; |
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|
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$log->logconfess("got hash, but without id") unless (defined($id)); |
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$log->logconfess("got hash, but id [$id] isn't number") unless ($id =~ /^\d+$/); |
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|
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my $database = $args->{database} || $self->database || $log->logconfess("no database?"); |
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|
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my $input = $args->{input} || ''; |
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|
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my $cache_file = $self->var_path( 'ds', $database, $input, $id ); |
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|
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$log->debug("using cache_file $cache_file"); |
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|
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if (-r $cache_file) { |
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my $ds_ref = retrieve($cache_file); |
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if ($ds_ref) { |
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$log->debug("cache hit: $cache_file"); |
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if ($ds_ref->{'ds'}) { |
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return $ds_ref->{'ds'}; |
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} else { |
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$log->warn("cache entry $cache_file corrupt. Use rm $cache_file to re-create it on next run!"); |
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} |
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} |
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} else { |
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#$log->warn("cache entry $cache_file doesn't exist"); |
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return undef; |
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} |
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|
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return undef; |
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} |
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|
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=head2 save_ds |
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|
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Store data_structure on disk. |
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|
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$store->save_ds( |
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database => 'name', |
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input => 'name', |
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id => $ds->{000}->[0], |
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ds => $ds, |
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); |
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|
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C<database> and C<input> are optional. |
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|
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=cut |
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|
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sub save_ds { |
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my $self = shift; |
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|
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my $args = {@_}; |
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|
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my $log = $self->_get_logger; |
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$log->debug("save_ds arguments:", sub { dump( \@_ ) }); |
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|
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foreach my $f (qw/id ds/) { |
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$log->logconfess("need $f") unless (defined($args->{$f})); |
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} |
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|
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my $database = $args->{database} || $self->{database}; |
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$log->logconfess("can't find database name") unless (defined($database)); |
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|
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my $input = $args->{input} || ''; |
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|
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my $cache_file = $self->var_path( 'ds', $database, $input ); |
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|
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mkpath($cache_file) unless (-d $cache_file); |
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|
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$cache_file = $self->var_path( 'ds', $database, $input, $args->{id} ); |
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|
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$log->debug("creating storable cache file $cache_file"); |
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|
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return store { |
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ds => $args->{ds}, |
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id => $args->{id}, |
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}, $cache_file; |
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|
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} |
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|
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=head2 load_lookup |
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|
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Loads lookup hash from file |
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|
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$data = $store->load_lookup( |
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database => $database, |
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input => $input, |
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key => $key, |
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); |
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|
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C<database> is optional. |
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|
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=cut |
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|
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sub load_lookup { |
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my $self = shift; |
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my $args = {@_}; |
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|
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my $log = $self->_get_logger; |
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|
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foreach my $r (qw/input key/) { |
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$log->logconfess("need '$r'") unless defined($args->{$r}); |
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} |
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|
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my $database = $args->{database} || $self->{database} || $log->logconfess("no database?"); |
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|
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my $path = $self->var_path( 'lookup', $database, $args->{input}, $args->{key} ); |
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|
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if (! -e $path) { |
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$log->error("lookup $path doesn't exist, lookups will be disabled. Try re-indexing $database/", $args->{input}); |
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return; |
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} |
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|
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if (my $data = retrieve($path)) { |
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$log->info("loaded lookup $path ", -s $path, " bytes"); |
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return $data; |
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} else { |
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$log->logwarn("can't load lookup $database/", $args->{input}, "/", $args->{key}, " from $path: $!"); |
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return undef; |
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} |
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} |
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|
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=head2 save_lookup |
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Save lookup data to file. |
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|
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$store->save_lookup( |
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database => $database, |
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input => $input, |
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key => $key, |
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data => $lookup, |
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); |
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|
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C<database> is optional. |
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|
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=cut |
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|
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sub save_lookup { |
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my $self = shift; |
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my $args = {@_}; |
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|
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my $log = $self->_get_logger; |
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|
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foreach my $r (qw/input key data/) { |
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$log->logconfess("need '$r'") unless defined($args->{$r}); |
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} |
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|
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my $database = $args->{database} || $self->{database} || $log->logconfess("no database?"); |
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|
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my $path = $self->var_path( 'lookup', $database, $args->{input} ); |
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mkpath($path) unless (-d $path); |
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|
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$path .= "/" . $args->{key}; |
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|
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my $t = time(); |
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|
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if (store $args->{data}, $path) { |
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$log->info(sprintf("saved lookup %s %d bytes in %.2fs", $path, -s $path, time() - $t)); |
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return 1; |
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} else { |
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$log->logwarn("can't save lookup to $path: $!"); |
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return undef; |
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} |
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} |
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|
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=head2 load_row |
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|
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Loads row from input database cache (used for lookups) |
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|
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$row = $store->load_row( |
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database => $database, |
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input => $input, |
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id => 42, |
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); |
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|
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C<database> is optional. |
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|
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=cut |
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|
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sub load_row { |
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my $self = shift; |
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my $args = {@_}; |
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|
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my $log = $self->_get_logger; |
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|
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foreach my $r (qw/input id/) { |
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$log->logconfess("need '$r'") unless defined($args->{$r}); |
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} |
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|
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my $database = $args->{database} || $self->{database} || $log->logconfess("no database?"); |
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|
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my $path = $self->var_path( 'row', $database, $args->{input}, $args->{id} ); |
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|
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if (! -e $path) { |
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$log->warn("input row $path doesn't exist, skipping"); |
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return; |
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} |
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|
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if (my $data = retrieve($path)) { |
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$log->debug("loaded row $path"); |
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return $data; |
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} else { |
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$log->logwarn("can't load row from $path: $!"); |
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return undef; |
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} |
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} |
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|
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=head2 save_row |
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|
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Save row data to file. |
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|
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$store->save_row( |
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database => $database, |
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input => $input, |
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id => $mfn, |
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row => $lookup, |
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); |
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|
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C<database> is optional. |
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|
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=cut |
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|
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sub save_row { |
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my $self = shift; |
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my $args = {@_}; |
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|
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my $log = $self->_get_logger; |
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|
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foreach my $r (qw/input id row/) { |
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$log->logconfess("need '$r'") unless defined($args->{$r}); |
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} |
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|
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my $database = $args->{database} || $self->{database} || $log->logconfess("no database?"); |
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|
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my $path = $self->var_path( 'row', $database, $args->{input} ); |
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|
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mkpath($path) unless (-d $path); |
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|
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$path .= "/" . $args->{id}; |
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|
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if (store $args->{row}, $path) { |
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$log->debug("saved row $path"); |
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return 1; |
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} else { |
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$log->logwarn("can't save row to $path: $!"); |
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return undef; |
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} |
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} |
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|
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|
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=head1 AUTHOR |
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|
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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|
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=head1 COPYRIGHT & LICENSE |
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|
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Copyright 2005-2006 Dobrica Pavlinusic, All Rights Reserved. |
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|
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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|
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=cut |
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|
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1; # End of WebPAC::Store |
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